Preheat oven to 350 degrees. Grease an 8-inch baking dish.
Prepare the pears by placing the peeled slices in a large bowl. Add vanilla, cinnamon, nutmeg, and ¼ teaspoon salt; toss to coat.
Pour the pear mixture into the prepared baking dish.
In a separate bowl, use a fork (or your fingers) to mix the butter, flour, oats, white sugar, brown sugar, pecans, and salt until well combined and crumbly.
Spread topping evenly over the pears.
Bake for 40-45 minutes, or until the top becomes golden brown and crispy and the pears are soft.
Remove from the oven and let cool for 5-10 minutes. Serve warm or at room temperature. Enjoy.